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Dynamics and Thermodynamic of Inherent Structure of Glass

Research Project

Project/Area Number 17K05589
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Research Field Mathematical physics/Fundamental condensed matter physics
Research InstitutionWaseda University

Principal Investigator

Aoki Keiko  早稲田大学, 理工学術院, 客員上級研究員 (90252163)

Project Period (FY) 2017-04-01 – 2020-03-31
Project Status Completed (Fiscal Year 2019)
Budget Amount *help
¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2019: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2018: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2017: ¥3,120,000 (Direct Cost: ¥2,400,000、Indirect Cost: ¥720,000)
Keywords分子動力学シミュレーション / ガラスの固有構造 / 弾性 / 分子動力学 / ガラス / 固有構造 / シンプレクティック解法 / 平均自乗変位 / 物性基礎論 / 計算物理
Outline of Final Research Achievements

Computer simulations were conducted to clarify to what extent can we reproduce characteristics of glass by the state of molecular aggregation and temperature alone.
It is experimentally known that in many glasses, molecules start to move larger distances above certain temperatures. We have succeeded to simulate several of such states and observed how the molecules diffuse. In addition, we have measured how elastic properties changes through different temperatures. For inherent states, which are final states of glass, a variety of diffusive nature was observed. On the other hand, all the states maintained high elasticity even for temperatures higher than that where the mobility of molecules become large.

Academic Significance and Societal Importance of the Research Achievements

複雑な現象を単純な要素に分解して, その本質を明らかにしょうする研究手法が, ガラスのコンピュータ・シミュレーションでも有効である事を示すことができた。
コンピュータ・シミュレーションでは, 複雑な要素を取り入れることが簡単であるが故に, 必ずしも本質的で無い要素を盛り込みがちである。また, それが故にシミュレーション方法が物理的に正しいかどうかの検証がなおざりにされがちである。物理的に精度が高く, かつ本質的な要素だけを取り出したコンピュータ・シミュレーションがガラスの最終的に行き着く状態の研究においても役に立つ事が示せたことは意義深い。

Report

(4 results)
  • 2019 Annual Research Report   Final Research Report ( PDF )
  • 2018 Research-status Report
  • 2017 Research-status Report
  • Research Products

    (8 results)

All 2020 2019 2018 2017

All Journal Article (2 results) (of which Peer Reviewed: 2 results,  Open Access: 2 results) Presentation (6 results) (of which Int'l Joint Research: 2 results,  Invited: 1 results)

  • [Journal Article] Anisotropy in condensed matter - liquid crystals, glass, and phase coexistence2019

    • Author(s)
      Aoki K M
    • Journal Title

      Journal of Physics: Conference Series

      Volume: 1252 Issue: 1 Pages: 012004-012004

    • DOI

      10.1088/1742-6596/1252/1/012004

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Structural transformation of smectic liquid crystals under surface tension2017

    • Author(s)
      Aoki Keiko M.
    • Journal Title

      Molecular Crystals and Liquid Crystals

      Volume: 647 Issue: 1 Pages: 92-99

    • DOI

      10.1080/15421406.2017.1289433

    • Related Report
      2017 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] 単成分ソフトコア粒子系の固有構造の空間および時間的不均一2020

    • Author(s)
      青木圭子
    • Organizer
      日本物理学会第75回年次大会
    • Related Report
      2019 Annual Research Report
  • [Presentation] ガラスの固有構造の硬さと動的不均一2019

    • Author(s)
      青木圭子
    • Organizer
      日本物理学会2019年秋季大会
    • Related Report
      2019 Annual Research Report
  • [Presentation] リエントラント液晶相の出現機構2019

    • Author(s)
      青木圭子
    • Organizer
      日本液晶討論会
    • Related Report
      2019 Annual Research Report
  • [Presentation] Liquid Crystal Phase Transition Investigated by Canonical Hydrostatic Molecular Dynamics Simulations2018

    • Author(s)
      Keiko M. Aoki
    • Organizer
      27th International Conference on Liquid Crystals, Kyoto, Japan
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research
  • [Presentation] Anisotropy in condensed matter - liquid crystals, glass, and phase coexistence2018

    • Author(s)
      Keiko M. Aoki
    • Organizer
      31st CSP Workshop:Recent Developments in Computer Simulation Studies in Condensed Matter Physics
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] ガラスの固有構造と準安定液晶相2017

    • Author(s)
      青木圭子
    • Organizer
      日本液晶学会
    • Related Report
      2017 Research-status Report

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Published: 2017-04-28   Modified: 2021-02-19  

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